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    <div id="box1">溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏 溢出隐藏</div>

    <div id="box2">这个只对背景透明</div>
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